Spider Farmer SF4000 450W Full Spectrum Dimmable LED Grow Light

The Spider Farmer SF4000 450W Full Spectrum LED Grow Light is a high-output board-style fixture designed for 4' × 4' grow tents, open grow rooms, and indoor gardens requiring dependable seed-to-harvest lighting with adjustable intensity and broad canopy coverage.

Updated for 2026, the SF4000 now features premium Bridgelux high-efficiency LEDs. The increased diode count and optimized layout maintain the strong output, uniformity, and dependable performance associated with the SF Series while allowing each diode to operate under less stress for improved thermal stability and long-term reliability.

Drawing 450 watts, the SF4000 delivers a rated photosynthetic photon efficacy of 2.7 µmol/J. This efficient performance provides the intensity required for a 4' × 4' flowering footprint while supporting vegetative coverage of up to 5' × 5'.

Its large board-style design distributes light across a broad canopy, helping reduce concentrated hotspots while improving exposure around the outer edges of the growing area. The optimized diode arrangement also supports deeper canopy penetration for more consistent development from the top of the plants to lower growth.

The complete full spectrum combines 3000K warm white, 5000K cool white, 660nm deep red, and 760nm infrared wavelengths. Together, these wavelengths support seedlings, vegetative development, flowering, and fruiting without requiring growers to change fixtures between stages.

An integrated dimming knob allows the output to be adjusted as plants mature. Lower intensity can be used during propagation and early vegetative growth, while output can be increased gradually as plants develop larger canopies and enter flowering.

Compatible SF4000 fixtures can also be connected for unified dimming. This allows growers operating larger rooms or multiple fixtures to adjust intensity simultaneously instead of changing each light independently.

The SF4000 uses a thick aluminum heat sink and fanless passive-cooling design to manage heat without internal fans. This allows silent operation while reducing maintenance requirements and eliminating a common mechanical failure point.

For growers seeking more advanced automation, the SF4000 can be paired with the optional Spider Farmer GGS Controller. Compatible controller functions can include remote adjustment, programmed lighting schedules, sunrise and sunset simulation, and overheat protection.

Designed for 4' × 4' grow tents and recommended for use with a 6-inch ventilation system, the SF4000 combines high-output full-spectrum lighting, straightforward dimming, quiet cooling, and flexible smart-control compatibility in a fixture backed by Spider Farmer’s 5-year limited warranty.

Premium Bridgelux LED Platform

The 2026 SF4000 uses high-efficiency Bridgelux LEDs arranged across an optimized, high-density board.

The increased diode count allows each LED to operate under a lower individual load, supporting improved thermal stability, dependable output, and extended operating life.

Efficient 450W Performance

Drawing 450 watts, the SF4000 achieves a rated fixture efficacy of 2.7 µmol/J.

This combination provides strong full-cycle intensity for 4' × 4' flowering spaces while maintaining efficient electrical performance.

Full Spectrum with Red and Infrared

The spectrum combines 3000K warm white, 5000K cool white, 660nm deep red, and 760nm infrared wavelengths.

This balanced output supports seedlings, vegetative growth, flowering, and fruiting through the complete plant lifecycle.

Broad 4' × 4' Flowering Coverage

The large board-style fixture distributes light across a broad growing area.

Its optimized diode layout helps maintain stronger exposure across the center, edges, and corners of a 4' × 4' flowering canopy.

Adjustable Dimming Control

The integrated dimming knob allows growers to tailor light intensity to different stages of plant development.

Output can be kept lower for seedlings and young plants before being increased gradually through vegetative growth and flowering.

Unified Multi-Light Dimming

Compatible SF4000 fixtures can be linked for synchronized intensity adjustment.

This simplifies lighting management in larger spaces where multiple fixtures are operating together.

Improved Canopy Penetration

The optimized diode density produces strong, even light across the growing area while helping photons reach deeper into the canopy.

This supports more consistent development between upper growth, lower branches, and plants positioned near the outer edges.

Silent Passive Cooling

A thick aluminum heat sink dissipates heat naturally without internal fans.

The fanless construction allows quiet operation while reducing maintenance requirements and potential mechanical failure points.

Optional GGS Smart Control

The SF4000 can be paired with a compatible Spider Farmer GGS Controller for more advanced lighting management.

Depending on the selected controller setup, growers can add remote control, schedules, sunrise and sunset simulation, and temperature-based protection.

What's Included

• Spider Farmer SF4000 LED Grow Light
• Two Stainless Steel Hanger Hooks
• Two Adjustable Rope Hangers
• Standard Power Cord
• User Manual